Case Studies

The product CDG Solution 3000, a 0.3% aqueous solution of chlorine dioxide, was evaluated for efficacy in biofilm elimination in industrial packed-bed wet scrubbers designed for VOC removal. The scrubber systems that were the focus of this study had used bromine-based compounds for several years, with generally mediocre results, prior to conducting the chlorine dioxide trial.

The product CDG Solution 3000, a 0.3% aqueous solution of chlorine dioxide, was evaluated for efficacy in the killing and controlling of algae deposits in one operating cooling tower located in Denver, Colorado. This project was conducted during an exceptionally warm and sunny period from August 9, 2010 to September 7, 2010, in a cooling tower that historically has had a serious algae problem.

In order to obtain New Technology Approval from the Massachusetts DEP, CDG Environmental conducted a 5-day pilot study at a groundwater pumping station in the Town of Canton. A full-scale CDG Gas:Solid™ chlorine dioxide generator was installed at the pump station and the system was operated from November 19 – 23, 2009. The primary objective of the piloting was to demonstrate that the CDG system delivers accurate chlorine dioxide dosing over a wide range of settings.

The use of Solution 3000™, a ready-to-use, 0.3% aqueous chlorine dioxide solution , has dramatically improved the water quality and system performance at an organic beef farm in Colorado by preventing the growth of biofilm on its 20-mm filters and eliminating coliform bacteria in the water supply. The application of a relatively low chlorine dioxide dose (0.7 mg/L), provided with a short detention time, has proved to be effective for 1) bacterial inactivation of the incoming raw water, 2) preventing biofilm growth on the filters that are approximately 30 minutes downstream of the injection point, 3) increasing the filter run times from 5 days to 5+ months, and 4) decreasing the overall filter budget of the plant by approximately 70 percent.

Mechanical, physical, and chemical treatments exist to try to eliminate or destroy the Legionella pneumophila bacteria. The most effective of these is chlorine dioxide, but the major problem until now has been the fact that it must be generated on site. A new aqueous chlorine dioxide product eliminates the need for onsite generation, and can be dosed into the water with a simple pump.